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We examine the prospects for observing weak flavour-changing neutral current (FCNC) decays of \B\ mesons at hadron colliders, including effects of anomalous $WWZ$~vertices. Since it is very difficult to measure the inclusive rate $B \rightarrow X_s \, \lp \lm$ one should consider exclusive modes such as \BKsmumu\ and \BKmumu. Even though this requires one to compute hadronic matrix elements, we show that experimentally observable quantities (ratios of decay rates) are not strongly parametrisation dependent. Some possibilities for reducing the theoretical uncertainties from other experimental data are discussed., Comment: 17 pages, uses LaTeX, epsf and uufiles. UCLA/93/TEP/26

We examine the prospects for observing weak flavour-changing neutral current (FCNC) decays of \B\ mesons at hadron colliders, including effects of anomalous $WWZ$~vertices. Since it is very difficult to measure the inclusive rate $B \rightarrow X_s \, \lp \lm$ one should consider exclusive modes such as \BKsmumu\ and \BKmumu. Even though this requires one to compute hadronic matrix elements, we show that experimentally observable quantities (ratios of decay rates) are not strongly parametrisation dependent. Some possibilities for reducing the theoretical uncertainties from other experimental data are discussed., Comment: 17 pages, uses LaTeX, epsf and uufiles. UCLA/93/TEP/26